Best program for coding in c#

Answer 1

True. Visual studio.
You can start with Visual studio community it is free.

https://visualstudio.microsoft.com/vs/community/

Answer 2

Also get unity if you want to create 3D projects to test what your doing, I use it alot

Answer 3

Just use Visual Studio.
Visual Studio support a lot of interesting things, that you can combine with your project. If you want to create games use Unity AND Visual Studio :)